VMware vSphere Web Services SDK Documentation

vCenter Storage Monitoring Service API [Experimental] Documentation

VMware provides an experimental storage monitoring service that runs in conjunction with vCenter Server
to provide reporting-level services about storage. The VMware vCenter Storage Monitoring Service API (SMS API)
is an experimental API packaged with the VMware vSphere Web Services SDK that enables developers
to pull together reports about storage consumption with just a few lines of code.

Note:

vCenter Storage Monitoring Service (SMS) API is Experimental, and is subject to change in future releases.